Вот что нашел об анализе подложки в продукте Cadence QRC Extraction QRC AoT offers Substrate Surface Noise Distribution (SND) for AC analysis, generating visual displays of the surface noise. SND computes the surface noise distribution of the three-dimensional substrate model generated by the QRC AoT Substrate Extraction engine (see Chapter 4, "Substrate Extraction,") and displays a color map of this distribution. Возможно есть нечто похожее и в пакете RF Designer
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